ok. sorry but NOOBS talking. thats the most i saw in the past comments.. ok. first of all. POWER DAMAGE (focus, blind rage) affects sonic boom, sonar AND sound quake.
POWER Duration (constitution, continuity ETC) affects SONAR and SILENCE.
Power Range (stretch) affects Sonic Boom Sonar And Silence.
capicci? FROM THERE you could set the build you want, you just have to be GOOD at what you do. dont go there just doing what the others says. you have to be GOOD at what you are/want to. my banshee build is just FOCUS and Blind rage. Reverb Helmet streamline and thats all the "Important", plus i put the Rush, heavy impact and the mod i dont know hows called to fast recovery when you get staggd. YES I HAVE  NO SHIELDS AND NO HP. i mean No Redirection and No Vitality. and im just pro at what i do. i use ALL my habilities and with sonar. my dread goes to  a minimum of 100k critic damage.
Duration will indeed help all of Banshee's abilties except for sonic boom. Don't listen to what others say, just because its stated in the wiki doesn't mean its true,anyone can edit a wiki page, so even if it is stated in here you can't expect to entirely believe it,....unless your completely dumb. As for Damage, focus/Blind rage will help with both sonic boom/ sound Quake as a few other people have commented before. I have heard from sevral other players in my clan that the Epicenter ( You ) of your Sound Quake will do more Damage output to the enemies closest to you, although i'm not sure about this and i'll have to test it more to confirm if this is true, although i have noticed a slight difference in damage. So to Clarify Duration mods WILL work in your builds, and depending on how long your abilities last you can probably dish out more damage the longer they last. My sound Quake lasts for about 12 seconds, and deals anyhting from 200-700 dmg. ( I was fighting lvl 40-50 infested on xini at the time and had focus fully ranked and blind rage with 4 ranks in along with constitution, and continuity ). Hope this was helpful, and remember all Warframes are customizable, which means you can do what ever you want to them! That goes for mod builds aswell 8 )
her build completely depends on the level of enemy. early-mid game ( enemy lvl 1- 45 or so) Power damage and power range with sonic boom (to kite with) and sonic quake (clears rooms). From there i'd go movement speed just to dart through the levels and sonic quake everything.Â
endgame i ditch sonic quake and take sonar instead. SC damage falls off too hard
for skills i only take sonic boom and sonar
for mods i take power range (this one is a must. really helps you keep enemies at bay with sonic boom), power efficiency(i'm all about sonic boom spam for maximum cc), power damage (cranks sonar damage to near broken levels), equilibrium (another mandatory mod. with the cc sonic boom provides you really dont have to take much damage, and when you do, sonic boom the group attacking you, run around and get any orb for more hp), shield recharge (i prefer fortitude. less knockdowns op), Max stamina (i take this instead of stamina recharge cuz if enemies get close you want to sonic boom and gtfo as far as possible. the more stamina you have, the further you can run) and sprint speed
also, a tanky shotgun sonar build is hilarious.Â
Similar to Excaliber's 4th, duration DOES affect the amount of energy that sound qake costs per second. Both duration and efficiency determine the cost per second.
excuse me but duration affects sound quake. if you put p cont in, it drops from 15/s to 11
Continuity actually helps wasting less energy on sound quake
There is no meta build for banshee build
What is always change on her build is Power Range
Becasue her survivability is base around her Silence
~40% only if you really like to run pass enemy or finisher with Savage Silence
~70% good for meleeing with Savage Silence and shotguns
~85% good for shotgun and some rifle
~100% good for rifle and overall
~115% good for sniper
~145% good for sonar but reduce silence utility massively. Make it up with Sonic Boom.
~190%+ OVERKILL unless you want to be gimmicky by have -duration
I find it funny how all the 2017 answers back to people from 2013, back then banshee didnt use Duration for sound quake hence why their saying that.